With characteristic bravado, Donald Trump has vowed that if voters return him to the White House, "inflation will vanish completely."

It's a message tailored for Americans who are still exasperated by the jump in consumer prices that began 3 1/2 years ago.

World shares were mixed on Wednesday, with European benchmarks mostly higher. Hong Kong's Hang Seng soared more than 6% while other Asian markets retreated as tensions escalated in the Middle East.

Oil prices extended gains after Iran fired dozens of missiles into Israel, potentially raising the risk of disruptions to supplies. That news overshadowed an upbeat report showing U.S. job openings rose unexpectedly in August as the American labor market continued to show resilience.